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Sun, 02 Aug 2026 06:44:51 -0700 (PDT) Received: from lima-kdev.local ([85.99.180.157]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49807ba8032sm112278855e9.15.2026.08.02.06.44.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 02 Aug 2026 06:44:50 -0700 (PDT) From: Kayra Cizmeci To: seanjc@google.com, pbonzini@redhat.com Cc: tglx@kernel.org, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Kayra Cizmeci Subject: [PATCH v3 1/2] KVM: x86: Fix sign-extension of the INT n vector in the emulator Date: Sun, 2 Aug 2026 16:44:27 +0300 Message-ID: <20260802134428.69252-1-kayracizmeci@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Currently the INT n operand use SrcImmByte which translates vectors above 127 to negative numbers. And this negative numbers gets to (vector << 2) and from there vector are handed and without any warnings. Use SrcImmUByte so the vector never translates to negative. Signed-off-by: Kayra Cizmeci --- v1: adds IDT limit check to __emulate_int_real(), link: https://lore.kernel.org/kvm/20260608123503.23298-1-kayracizmeci@gmail.com/ v2: fixes the sign-extension of INT n, link: https://lore.kernel.org/kvm/20260608134642.25849-1-kayracizmeci@gmail.com/ v3: rewrote commit messages, split 1 commit into 2 commits and rebased onto current mainline. arch/x86/kvm/emulate.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index b566ab5c7515..ec3138801bb7 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -4314,7 +4314,7 @@ static const struct opcode opcode_table[256] = { I(Stack, em_leave), I(ImplicitOps | SrcImmU16 | IsBranch | ShadowStack, em_ret_far_imm), I(ImplicitOps | IsBranch | ShadowStack, em_ret_far), - D(ImplicitOps | IsBranch), DI(SrcImmByte | IsBranch | ShadowStack, intn), + D(ImplicitOps | IsBranch), DI(SrcImmUByte | IsBranch | ShadowStack, intn), D(ImplicitOps | No64 | IsBranch), II(ImplicitOps | IsBranch | ShadowStack, em_iret, iret), /* 0xD0 - 0xD7 */ -- 2.53.0